docs: def imsiDetachIndication():
      """IMSI DETACH INDICATION Section 9.2.12"""
      a = TpPd(pd=0x5)
      b = MessageType(mesType=0x1)  # 00000001
      c = MobileStationClassmark1()
      d = MobileId()
      packet = a / b / c / d
      return packet